基于DEM的山顶点和鞍部点一体化提取  

Integrated Extraction of Surface Peaks and Saddles Based on DEM

作　　者：吴婕 董有福 彭瑾 代宪鹏 WU Jie;DONG Youfu;PENG Jin;DAI Xianpeng(School of Geomatics Science and Technology,Nanjing Technology University,Nanjing 211816,China;Earthquake Administration of Jiangsu Province,Nanjing 210014,China)

机构地区：[1]南京工业大学测绘科学与技术学院,江苏南京211816 [2]江苏省地震局,江苏南京210014

出　　处：《测绘地理信息》2018年第5期85-88,共4页Journal of Geomatics

基　　金：国家自然科学基金资助项目(41101360)

摘　　要：在提取流域边界线后,通过分离边界线分量构建山脊线链表,间断识别像素链表上的高程极大值点和极小值点,实现山顶点和鞍部点的一体化提取。选择高山、中山、低山3种地形样区,采用25m分辨率DEM（digital elevation model）为实验数据,分别利用本文提出的一体化方法与常用的窗口分析法、正反地形法进行提取山顶点和鞍部点的实验分析。结果表明,一体化方法不仅能维持山顶点和鞍部点空间上的耦合关系,同时能保证它们在数量上的对应性。此外,该方法也有适用性好、提取速度快的特点。Surface peaks and saddles are two important terrain feature points and they both have strict spatial and quantitative relationships of correspondence and constraint.This paper proposed a method that surface peaks and saddles could be extracted integrally by extracting first the watershed boundaries,then constructing ridgeline list by separating boundaries,after that,identifying intermittently the maximum high and minimum low points on the pixel lists.Selecting three kinds of sample areas as high altitude mountain,medium altitude mountain and low altitude mountain and using 25 mDEM（digital elevation model）as experimental data,experiments of extracting surface peaks and saddles were conducted through the method of integration in question and common methods such as neighborhood analysis,DEM on the forward and reverse.The experimental results showed that integration method could not only keep the coupling relationship in space but also keep the correspondence in quantity.Besides,the method also reflected its good applicability and high extracting speed.

关 键 词：山顶点 鞍部点 耦合关系 一体化 流域边界线 

分 类 号：P208[天文地球—地图制图学与地理信息工程]